Drill Bits - Bosch 33614 Operating/Safety Instructions Manual

Operating Tips
TETHER HOOK
The purpose of the tether hook is to secure
the tool when working on ladders,
scaffolding, or elevated heights to prevent
the tool from hitting the ground if accidentally
dropped. For best results, it is recommended
to use 1/4" braided nylon rope or similar
material.
You will extend the life of your bits and do
nearer work if you always put the bit in
contact with the work before pulling the
trigger. During the operation, hold the tool
firmly and exert light, steady pressure. Too
much pressure at low speed will stall the tool.
Too little pressure will keep the bit from
cutting and cause excess friction by sliding
over the surface. This can be damaging to
both tool and bit.
DRILLING WITH VARIABLE SPEED
The trigger controlled variable speed feature
will eliminate the need for center punches in
hard materials. The variable speed trigger
allows you to slowly increase RPM. By using
a slow starting speed, you are able to keep
the bit from "wandering". You can increase
the speed as the bit "bites" into the work by
squeezing the trigger.
DRIVING WITH VARIABLE SPEED
Variable speed drills will double as a power
screwdriver by using a screwdriver bit in the
drill mode. The technique is to start slowly,
increasing the speed as the screw runs
down. Set the screw snugly by slowing to a
stop. Prior to driving screws, pilot and
clearance holes should be drilled.
FASTENING WITH SCREWS
This procedure shown in (Fig. 7) will enable
you to fasten materials together with your
Cordless Drill/Screwdriver without stripping,
splitting or separating the material.
First, clamp the pieces together and drill the
first hole 2/3 the diameter of the screw. If the
material is soft, drill only 2/3 the proper
length. If it is hard, drill the entire length.
Second, unclamp the pieces and drill the
second hole the same diameter as the screw
shank in the first or top piece of wood.
Third, if flat head screw is used, countersink
the hole to make the screw flush with the
surface. Then, simply apply even pressure
when driving the screw. The screw shank
clearance hole in the first piece allows the
screw head to pull the pieces tightly together.
The adjustable screw drill accessory will do
all of these operations quickly and easily.
Screw drills are available for screw sizes No.
6, 8, 10 and 12.
FASTENING
2. Drill same dia-
WITH SCREWS _l _
mcet_ a_ank
_ 3. Countersink
1. Drill 2/3 diameter and _ _ same diameter
2/3 of screw length for _ _ as screw head.
soft materials, full ,C_ ' "4 t . ",, ' -_
length for hard _." I _ "._ ' ] r_ Ad ustable
materials. "_,'U' '_\\" '| II screw
_," ,',1 _ Apply a slight
_i ' :/i e_len Prriesisve _'_\i'_i ]
', ", i _ screws.
m
DRILL BITS
Always inspect drill bits for excessive wear.
Use only bits that are sharp and in good
condition.
TWIST BITS: Available with straight and
reduced shanks for wood and light duty metal
drilling. High speed bits cut faster and last
longer on hard materials.
CARBIDE TIPPED BITS: Used for drilling
stone, concrete, plaster, cement and other
unusually hard nonmetals. Use continuous
heaw feed pressure when employing carbide
tip bits.
DRILLING WOOD
Be certain workpiece is clamped or anchored
firmly. Always apply pressure in a straight line
with the drill bit. Maintain enough pressure to
keep the drill "biting".
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